"Of course, it's not made to survive an eruption, and the area in which it is installed is covered in volcanic ash and is a unstable area.

"Only a couple of weeks ago, there was a small eruption of Merapi and at this stage, we're not sure what the instrument sounded like and if it in fact, survived the eruption."

Mr Stern says Indonesian artist Andreas Siagian acted as a consultant with local communities in the development of the instrument on the volcano.

"I think the artists themselves were very respectful of the mythology around the mountain and the significance it has in Javanese culture, and wanted the installation to be seen as an offering to the mountain, rather than some sort of colonisation of it," he said.

"So they were very careful to install the work that responds to the mountain, rather than try to dominate its environment.

"It's a very receptive installation and I think they see it as an offering to the mountain."